Electric Forces and fields question

Two charges are placed at an equal distance x from point P, as shown in the following diagram. Charge A is placed directly west of P and B is placed directly north of P.

1)If A is given a charge of –Q and B is given a charge of +Q, what is the direction of the resulting electric field at point P?
A) southeast
B) northwest
C) northeast
D) southwest
Incorrect. Your answer=B, Correct answer=D

I need an explanation on how it's done, especially on how you get the angle which it travels and stuff. Thanks

Two charges are placed at an equal distance x from point P, as shown in the following diagram. Charge A is placed directly west of P and B is placed directly north of P.

1)If A is given a charge of –Q and B is given a charge of +Q, what is the direction of the resulting electric field at point P?
A) southeast
B) northwest
C) northeast
D) southwest
Incorrect. Your answer=B, Correct answer=D

I need an explanation on how it's done, especially on how you get the angle which it travels and stuff. Thanks

Forget the dipole diagrams !

What is the direction of the Electric Field at P due to the -Q charge at point A ?

What is the direction of the Electric Field at P due to the +Q charge at point B ?